If you run a company, you’ve probably thought about how to manage your shareholding structure over time - especially as you grow, bring in investors, or generate surplus cash.
One option you may hear about (particularly in listed-company circles) is an on-market share buyback. It can be a useful tool, but it’s not something you want to approach casually. Buybacks interact with the Corporations Act (particularly Part 2J.1), governance, disclosure requirements (for listed entities), and your internal company documents.
In this guide, we’ll walk you through what an on market share buyback is, why a company might do one, and the key legal and practical steps to think about in Australia.
What Is An On-Market Buy Back?
An on market buy back is when a company buys back its own shares through a prescribed financial market (most commonly the ASX for Australian listed companies). The company effectively becomes a buyer of its own shares, purchasing them at market price, in the same way an ordinary investor might.
When the buyback completes, the shares are usually cancelled (reducing the number of shares on issue), which can change things like:
- each remaining shareholder’s percentage ownership
- earnings per share calculations (for listed companies)
- control dynamics (e.g. whether a major shareholder’s percentage increases)
- the company’s balance sheet (because cash is used to fund the purchases)
Is An On-Market Share Buyback Only For Listed Companies?
In practice, on-market buyback activity is typically associated with listed entities because it relies on having an “on-market” trading venue where shares are bought and sold.
If you’re running a proprietary company (a “Pty Ltd”) or an unlisted public company, you generally won’t have an “on-market” facility in the same way. That doesn’t mean you can’t buy back shares - it usually just means the buyback will look more like an off-market or selective buyback, done directly with the shareholder(s).
Either way, the underlying legal issues (solvency, approvals, proper process, and clean paperwork) still matter.
How Is This Different From Other Buybacks?
Companies can buy back shares in a few different ways. Broadly:
- On-market buyback: shares are bought through a prescribed market at market price.
- Off-market buyback: shares are bought directly from shareholders, typically under a defined offer and price/terms.
- Selective buyback: shares are bought back from specific shareholders (not all shareholders).
The best approach depends on your company type, shareholder base, and the commercial problem you’re trying to solve.
Why Would A Company Do An On-Market Share Buyback?
A buyback isn’t just a “financial engineering” exercise - it can be a legitimate strategic decision. Common reasons Australian companies consider an on-market buyback include:
- Returning surplus cash to shareholders (an alternative to dividends in some circumstances)
- Improving capital structure (for example, where the company is holding more cash than it needs)
- Signalling confidence to the market (listed entities may buy back when they believe shares are undervalued)
- Offsetting dilution from employee share plans or capital raisings
- Increasing ownership percentages of remaining shareholders (because there are fewer shares on issue after cancellation)
From a small business perspective, the “why” usually comes back to control and flexibility. If your shareholder base changes over time, you’ll want options that allow you to manage exits, reduce disputes, and keep ownership aligned with who is actively building the business.
If your company has (or may have) different rights attached to different shares, it’s also important to understand how a buyback could affect each class. This is a good time to review how your share structure works, including any different classes of shares you might have in place.
How Does An On-Market Buy Back Work In Practice?
The exact steps depend on whether you’re listed and what approvals are required, but the broad lifecycle of an on-market buyback tends to look like this.
1. Clarify The Commercial Goal (And The Buyback Type)
Start by getting clear on what you’re trying to achieve. For example:
- Are you trying to return funds to shareholders generally?
- Are you trying to reduce the number of shares on issue?
- Are you trying to manage a shareholder exit?
- Are you trying to simplify your cap table before raising capital?
This matters because it shapes whether an on-market process is suitable, or whether another structure would better fit (and carry less compliance burden).
2. Check Your Company’s Internal Rules
Your company’s internal documents often set the ground rules for what you can and can’t do with shares.
In particular, you should check:
- Your Company Constitution (or replaceable rules) for any restrictions or procedures around share cancellations, buybacks, shareholder notices, and director powers.
- Any Shareholders Agreement for pre-emptive rights, exit mechanics, valuation rules, or consent requirements that could be triggered by a buyback.
This is one of the biggest “early trip hazards” we see: the Corporations Act might allow a process in principle, but your own documents might require extra steps, approvals, or notices.
3. Confirm Funding And Solvency
A buyback uses company money (or company assets), so directors need to be comfortable the business can afford it.
Even if the buyback makes sense strategically, the company still needs to be able to:
- pay its debts as and when they fall due, and
- continue operating sustainably after the buyback.
This is not just “good governance” - directors have legal duties, and solvency is a recurring theme in company decision-making. Under the Corporations Act, a company generally must not buy back shares if it would materially prejudice the company’s ability to pay its creditors.
4. Determine Approvals And Notifications
Depending on the structure, a buyback may require:
- board approval (directors’ resolution)
- shareholder approval (ordinary or special resolution, depending on the type of buyback and the company’s circumstances)
- notices to shareholders and/or the market (particularly for listed entities)
- lodgements and record updates
As a general rule under Part 2J.1 of the Corporations Act, most buybacks need shareholder approval unless an exception applies. For many companies (including listed companies), an on-market buyback may be able to proceed with board approval only where it falls within the “10/12 limit” (broadly, no more than 10% of the company’s voting shares in the 12-month period) and other conditions are met. If it exceeds that threshold (or doesn’t satisfy the relevant conditions), shareholder approval is typically required.
Listed companies also need to consider ASX Listing Rules and continuous disclosure obligations. In practice, an ASX on-market buyback usually involves specific ASX announcements/forms and a defined timetable (including commencement and daily/periodic reporting), so it’s important to map out the ASX process early.
Depending on the company type and buyback structure, there may also be ASIC notifications and updates required to reflect the cancellation and the company’s share structure after completion.
5. Execute Properly (Signing And Record-Keeping)
Buybacks tend to come with a “paper trail” - and it’s important to execute documents correctly, especially where the company is entering into buyback-related agreements or formal board minutes.
Many companies execute documents under section 127 of the Corporations Act. If that’s relevant for your business, it’s worth ensuring you understand the mechanics of signing documents under section 127.
After completion, you’ll also want to ensure your share records are consistent. For example, you may need to update and maintain Share Certificates (where your company issues them) and ensure your register reflects cancellations or changes.
Key Legal And Compliance Issues To Get Right
An on-market buyback can sound straightforward - “we’ll just buy some shares back” - but there are a few legal pressure points that can create real risk if you don’t address them early.
Director Duties And Decision-Making
Directors need to act in the best interests of the company as a whole, and for a proper purpose. That means the buyback decision should be supported by a clear rationale and proper board process (including documenting why the buyback is appropriate).
If a buyback disproportionately benefits one group (for example, by shifting control), you’ll want to tread carefully and document the basis for the decision.
Equal Treatment And Shareholder Fairness
For listed entities, an on-market process can help support fairness because shares are acquired at market price from any seller in the market.
For smaller companies considering a buyback outside an on-market setting, fairness issues can be more acute - especially around valuation, who can participate, and whether minority shareholders are being treated appropriately.
Impact On Control And Voting Power
Because shares are typically cancelled after a buyback, each remaining shareholder’s percentage can rise without them buying any additional shares.
This can be a benefit, but it can also:
- create unexpected control changes
- trigger thresholds in shareholder agreements
- cause disputes if shareholders feel the buyback changes the “deal” they invested in
If your business has multiple founders, investors, or family shareholders, it’s worth stress-testing how the ownership percentages could change before you proceed.
Disclosure And Market Rules (For Listed Companies)
If you are listed, you will generally need to consider:
- the ASX Listing Rules (including buyback notifications and timetables)
- continuous disclosure obligations
- any trading restrictions (including insider trading risks)
Even where your intentions are completely legitimate, a buyback can draw attention, so the compliance and communications side matters.
Tax Treatment And Shareholder Outcomes
Tax outcomes differ depending on the buyback structure and shareholder profile. For example, an on-market transaction is often treated like an ordinary on-market sale for the selling shareholder, but it’s important not to assume the tax position without checking.
At a company level, you’ll also want to factor in how cash reserves are managed and whether there are better alternatives (such as dividends or other capital management strategies).
This information is general only and isn’t tax advice. We recommend speaking with your accountant or tax adviser early (alongside legal advice), so the structure supports both compliance and commercial goals.
ASIC Filings And Share Register Updates (Where Relevant)
Buybacks can involve corporate records, notifications, and changes to the share structure that must be properly reflected.
For proprietary companies, you may also be juggling separate processes around share movements more generally, and it’s useful to understand how ASIC transfer of shares reporting and record-keeping typically works (even though a buyback is not always the same thing as a transfer between two private parties).
What Documents Should You Put In Place?
Even when the buyback is done “on market”, there are still governance and documentation pieces you should get right. If the buyback is done off-market (which is often the reality for small and mid-sized private companies), documentation becomes even more important.
Depending on your circumstances, key documents to consider include:
- Board Minutes / Directors’ Resolutions: documenting the decision to proceed, why it’s in the company’s interests, and the key commercial terms and funding.
- Shareholder Resolutions: if required, resolutions approving the buyback and any associated steps.
- Buyback Terms Or Agreement: for off-market buybacks this is often critical; it sets out price, timing, conditions, completion mechanics, and what happens if something goes wrong. In some cases a tailored Share Buyback Agreement is appropriate.
- Updated Company Register And Share Records: ensuring the post-buyback position is clear and consistent for your cap table and governance.
- Updated Constitution Or Governance Documents (If Needed): where the existing rules don’t properly deal with buybacks or share cancellations, you may need to update your Company Constitution so the process is clear for the future.
- Shareholder Arrangements: if a buyback changes control dynamics or sets a precedent for shareholder exits, it may be time to revisit your Shareholders Agreement to reduce the risk of disputes later.
The main goal is to ensure your buyback isn’t just commercially sound - it’s also properly authorised, properly recorded, and consistent with the company’s governing documents.
Key Takeaways
- An on-market buyback is when a company buys its shares through a prescribed financial market (commonly the ASX), usually at market price.
- While on-market buybacks are most common for listed companies, private companies may still consider buybacks (usually structured off-market) for capital management and shareholder exits.
- Before starting, you should check your internal rules, including your Company Constitution and any Shareholders Agreement, as they can impose additional requirements.
- Directors need to consider solvency, proper purpose, and fairness - and document the decision-making process carefully.
- Buybacks can change ownership percentages and control, so it’s important to model the post-buyback cap table before proceeding.
- Depending on the buyback type and size, shareholder approval and specific ASIC/ASX notifications may be required (including consideration of the Corporations Act “10/12 limit” where applicable).
- Clean documentation and execution (including correct signing and updating share records) helps prevent disputes and compliance issues later.
If you’d like help planning or documenting an on-market share buyback (or an off-market buyback for your private company), you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.
